In 1957, at the age of 16, she won the Geneva International Competition and the Ferruccio Busoni International Competition within three weeks. At the Bolzano Competition she met Arturo Benedetti Michelangeli
. When she was about 20 and in the throes of an artistic crisis, she sought him out for advice.
In 1965 she became the first pianist from the Western Hemisphere to win first prize at the Chopin Competition in Warsaw, and the following year, she made her U.S. debut in Lincoln Center's Great Performers Series. Her long association with the Deutsche Grammophon
label began in 1967.